Reliable heat protection with athermal windshield film
Car tinting is not a tribute to fashion, but protection from bright sunlight, which can turn the interior of a vehicle stuck in traffic into a steam room. They also harm the interior, as the leather upholstery of the seats suffers from them, losing its presentation. According to GOST 5727-88, the windshield of a car must transmit at least 75% of the light, so the possibilities of its tinting are limited. But in order to protect yourself from the effects of the sun, it is not necessary to fight the visible spectrum. It is enough to get rid of ultraviolet and infrared radiation, which is not visible to the eye, but plays a key role in warming up the cabin. For this purpose, an athermal film is used on the windshield, which transmits light waves of the visible spectrum within the limits established by GOST, almost completely blocking access to infrared and ultraviolet rays.
Features of athermal films
Modern technologies make it possible to create unique materials with predetermined properties. These include athermal films that work as a filter for the invisible range of light waves. Most of the heat objects receive not from visible rays, but in the ultraviolet and infrared range. Therefore, if they close access to the car interior, then it will heat up much less, and visibility will practically not change, and the glass will seem transparent.
Such films are made using special technologies of their many layers, each of which is tuned to absorb a narrow spectrum of radiation. Taken together, this makes it possible to cover almost completely the ultraviolet range of waves and more than half of the infrared.
High-quality films block access to more than 90% of the thermal radiation falling on the windshield of a car.
Athermal film is almost invisible on the glass of the car, so it does not interfere with the view at night. Its main task is to block thermal and ultraviolet rays. In addition, it protects the glass covered with them from chips, scratches and microcracks, and also provides protection for the driver and passengers from flying fragments in the event of an accident.
Advantages of athermal tinting:
- prevents heating of the car interior, making the trip more comfortable and reducing fuel consumption for air conditioning;
- protects plastic, leather and wooden trim elements from deformation and fading;
- fully complies with the requirements of GOST 5727-88 and traffic rules;
- does not block the passage of radio waves.
Types of films
All known types of films can be divided into four main groups:
The first is made of polyester, which consists of many layers. Some of them are transparent. Their purpose is to provide strength and protection against burnout. Others are painted in the main color of the film. Their number determines the throughput of the film - the more such layers, the darker the material looks. The advantage of this type of film is its low price and large color gamut.
In metallized materials, some of the polyester layers have the thinnest coating, which is usually made of aluminum. Such material reflects infrared radiation much better than painted films, which means it better protects the car interior from heating.
In spatter film, the desired product color is obtained by using ion-exchange coated layers. Technologically, this is the most complex and expensive manufacturing method. This method allows you to make a perfectly even coating of almost any substance. Materials produced in this way have high wear resistance and practically do not burn out. Spatter-metallized films are a combination of three previous technologies.
Athermal films produced by various manufacturers differ both in manufacturing technology and consumer properties. Therefore, when buying and installing, special attention must be paid to the following indicators:
- ability to transmit light;
- product color;
- method of installation on glass;
- operational resource.
Depending on the glass on which the film will be installed, its throughput may be different: the most transparent ones are installed on the windshield of the car, and the most dark ones - on the back.
The color of the film may also be different. Often found from a product with a bluish and greenish tint. The Chameleon, which changes shades depending on the lighting, has gained particular popularity.
Feedback from motorists suggests that shades of blue make eyes tired during long trips, therefore, despite the beautiful appearance, it is worth considering when using them. The vast majority of car wraps are self-adhesive, making them easy to install. Some vehicle owners prefer to use the services of car dealerships so as not to suffer with high-quality glass preparation, as they must be perfectly clean. But many people do this work themselves.
The coating is installed from inside the car: this not only protects the coating from environmental influences and during washing, but also, in an extreme situation, protects the fragments in the passenger compartment from scattering. A well-made and glued coating lasts at least five years, so its installation will allow you to forget about overheating of the cabin by the sun's rays for a long time.
Light transmittance of film and windshield
When choosing a film, you should pay attention to its light transmission. GOST requires that for a windshield it be 75%. But if you select and install a film with such an indicator, then the car can be stopped at the very first traffic police post. The reason will be that the glass itself has far from 100% transparency. Most often, this figure is in the region of 90%. Therefore, if we take a film that transmits 80% of the light and put it on such glass, then the total result will be determined as the product of the transmission coefficients: 0.8 x 0.9 = 0.72, i.e. 72%. Formally, this figure is less than acceptable, so such a car tinting will be considered a violation of traffic rules.
Therefore, the film should be installed taking into account the available glass transmission capacity, which is best measured beforehand. Often a car can have the original factory tint, which will also affect the overall result.
It should be noted that such small deviations cannot be noticed by eye, but the device picks up easily. Of course, it is unlikely that a traffic police officer will stop cars with outwardly transparent windows to check their throughput. But why violate GOST, if it is easy to do without it? For side windows, the requirements are less stringent. For them, a throughput of 70% is allowed, so it is fashionable to put a darker film on them. Ceteris paribus, it will let in even less heat, which means it will become more comfortable in the cabin. It is very unpleasant to get into a vehicle that has stood for several hours in the sun. The sensations from this are comparable to an attempt to settle down on a hot frying pan. The presence of athermal films on the windshield and side windows will easily remove this problem - with them the interior warms up noticeably less.
Chameleon has become a popular trend of athermal films. Such a coating not only has all the useful heat-shielding properties, but also has a rich and original color. As a result, the windshield of the car acquires an unusual hue that shimmers in the sun, similar to the tinting of a business class vehicle. Such films are of impeccable quality and high operational resource.
Chameleon is a great design solution for changing the look of a car. In the manufacture of this material, a unique technology for applying various metals using magnetron sputtering is used. The result is a coating consisting of almost 20 layers that provide the required protective properties and eye-catching color effect.
Thanks to the manufacturing technology, Chameleon film:
- does not fade from exposure to direct sunlight;
- provides light transmission in the range from 83 to 90%;
- does not differ at all from factory-made glass of business and premium class cars.
In the sun, such an athermal coating, which initially has a purple hue, shimmers very beautifully with all sorts of delicate colors, for which it got its name "Chameleon". When buying and installing a coating, special attention should be paid to its throughput. If the Chameleon has it equal to 83%, and the windshield has 90%, then the result will be the maximum allowable figure equal to 75%. Lower rates will lead to violation of traffic rules and GOST.
Reviews of motorists
Feedback from car owners who have installed an athermal film on their windshield is positive. The microclimate in the cabin changed dramatically after that, which is especially felt in cars that are not equipped with air conditioning. Now the car can be safely left in the parking lot, without fear that upon return, its interior will look like an oven. Particularly pleased are those who have pasted on a Chameleon, which radically transformed the appearance of the car. Therefore, this type of film is becoming especially popular.
Some motorists say that they forgot to take into account the light transmission of glass, resulting in a result lower than that established by GOST. Now they fear that such a coating will have to be removed. Therefore, when choosing a brand of athermal film, special attention should be paid to this factor. To be completely sure that the car will satisfy the traffic rules, you can take a small piece of the coating and, after gluing it, measure the total light transmission.